Epithelial Tissues Location and Function

Functions of the Simple squamous epitelium

• Diffusion/Osmosis

• Filtration

• Secretion

• Reduced Friction

Locations of Simple squamous epithelium

• This type of epithelium lines the alveoli (gas exchange) of the lungs & parts of the kidney tubules

• Mesothelium is the special type of simple stamped ET that is part of series membranes, which line the internal surface of ventral body cavities and cover organs

• Endothelium is the special type of simple squamous ET that lines blood vessels, lymphatic vessels, and the heart

Functions of Simple Cuboidal Epithelium

• Secretion

• Absorption

Not good for protection! (One layer of cells don’t do protection

Locations of simple Cubodial epithelium

• Nephron Tubules

• Thyroid glands (secrtes thyroid hormones but absorb things to produce them)

Functions of Simple Columnar Epithelium

• Absorption

• Secretion (mucus, enzymes, etc.)

• Movement of mucus by cilia (if applicable)

Location of Simple columnar epithelium (ciliated)

Uterine/fallopian tube that propels egg towards her uterus

Locations of Simple columnar epithelium (non-cillated)

Stomach, small intestine, and large intestine only absorb nutrients and secrete mucus and digestive enzymes

Function of Stratified squamous epithelium

Protection of underlying tissues from abrasion and pathogens

Locations of Stratified Squamous Epithelium

• Stratified Squamous non-keratinized ET

• Stratified Squamous keratinized ET

Stratified Squamous non-keratinized ET

Must be kept moist (all cells are alive- nuclei visible on the top layers)

• Oral cavity

• Anus

• Vagina

Stratified Squamous keratinized ET

Is tougher and water-resistant (top layer of cells will lack nuclei and be dead)

• Epidermis

Function of Transitional Epithelium

Distensible but allows recoiling

Locations of Transitional Epithelium

• Urinary Bladder

• Ureters

• Urethra

Function of Pseudostratified Columnar Epithelium

• Protection

• Secretion

• Movement by mucus by cilia (if applicable)

What are the two types of Psuedostratified Columnar ET

• Psuedostratified Ciliated Columnar ET (PCCE)

• Non-Ciliated

Location of Pseudostratified Ciliated Columnar Epithelium (PCCE)

• Upper Respiratory Tract (Nasal Cavity, Nasopharynx, trachea)

• Bronchi

Location of Pseudostratified Columnar ET

Epididymis